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Across 1. a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans. 4. the variety of life in the world or in a particular habitat or ecosystem. 6. (biology) the theory that cells form the fundamental structural and functional units of all living organisms; proposed in 1838 by Matthias Schleiden and by Theodor Schwann 8. noun 1. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms. 10. the activity or condition of competing. 12. a biological community of interacting organisms and their physical environment. 13. The gene theory is 15. the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behavior, origin, and distributio

Down 2. nounBIOLOGY 1. the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution. 3. noun 1. the tendency toward a relatively stable equilibrium between interdependent elements, esp. as maintained by physiological processes. 5. the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth. 7. the action or process of adapting or being adapted. 9. a group of people living in the same place or having a particular characteristic in common. 11. a small room in which a prisoner is locked up or in which a monk or nun sleeps. 14. nounECOLOGY 1. a large naturally occurring community of flora and fauna occupying a major habitat, e.g., forest or tundra.